If you used an online test of any sort to determine your personality type, it is recommended that you become educated in Jungian Cognitive Functions. The following resource is a very all-encompassing outline of the system and describes the difference between the generalizations perpetuated by MBTI and the more systematic approach cognitive functions take in categorizing people in the way they think:

As OP says, it is free group chat. But it is way better than Skype. It supports up to 10 simultaneous video streams. It handles poor connections by compressing the video instead of lagging out. It has a far better interface for managing multiple video streams, with a row of available thumbnail videos (about big enough to see what everyone is doing in standard face-shot video) and one main stream you can change by clicking to select the smaller ones. I think it even supports simultaneous screen-sharing and webcam, unlike Skype.

Lastly, it has some fun toys like synchronized YouTube videos that might have some real potential for specific things like reviewing a presentation. Though I have yet to get YouTube sync working in Linux. It could be because I'm a FOSS-loving Chromium-user. It also seems extensible via plugins, though I've yet to play around with that.

I think Hangouts is the edge G+ needed to have any chance against FB. They're still an underdog, but at least now they're more of a dark horse underdog than a funny loser underdog.